Röhrenmarken / Tube Brands noch in Arbeit / still under construction
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| HARMONIX (Russland) |
| HARP |
| HEINTZE & KAUFMANN |
| HELIOTRON |
| HERCULES |
| HI-CONSTRON |
| HYGRADE |
| HYGRADE-SYLVANIA |
| HYTRON |
| HYVAC |
| HUTH |
| HEUSSEN |
| HANSEN Schweden |